Consommation d’API REST et GraphQL

query GetUsers {
  users {
    id
    name
    email
    posts { id title }
  }
}

mutation CreateUser($input: UserInput!) {
  createUser(input: $input) {
    id
    name
    email
  }
}

import 'package:flutter/material.dart';
import 'package:graphql_flutter/graphql_flutter.dart';

void main() async {
  await initHiveForFlutter(); // nécessaire pour le cache de graphql_flutter
  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  @override
  Widget build(BuildContext context) {
    final HttpLink httpLink = HttpLink("https://api.example.com/graphql");

    ValueNotifier<GraphQLClient> client = ValueNotifier(
      GraphQLClient(
        link: httpLink,
        cache: GraphQLCache(store: HiveStore()),
      ),
    );

    return GraphQLProvider(
      client: client,
      child: const MaterialApp(
        debugShowCheckedModeBanner: false,
        home: UsersPage(),
      ),
    );
  }
}

class UsersPage extends StatelessWidget {
  const UsersPage({super.key});

  final String query = """
    query GetUsers {
      users {
        id
        name
        email
      }
    }
  """;

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: const Text("Liste des utilisateurs")),
      body: Query(
        options: QueryOptions(document: gql(query)),
        builder: (QueryResult result, {fetchMore, refetch}) {
          if (result.isLoading) {
            return const Center(child: CircularProgressIndicator());
          }

          if (result.hasException) {
            return Center(child: Text("Erreur: ${result.exception.toString()}"));
          }

          final users = result.data?['users'] ?? [];

          return ListView.builder(
            itemCount: users.length,
            itemBuilder: (context, index) {
              final user = users[index];
              return ListTile(
                leading: CircleAvatar(child: Text(user['id'].toString())),
                title: Text(user['name']),
                subtitle: Text(user['email']),
              );
            },
          );
        },
      ),
    );
  }
}